<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../react18/react.development.js"></script>
  <script src="../react18/react-dom.development.js"></script>
  <script src="../react18/babel.min.js"></script>
</head>

<body>
  <div id="app"></div>
  <script type="text/babel">
    class App extends React.Component{
      state = {
        isHot: true
      }
      render(){
        const {isHot} = this.state
        if(isHot){
          return (
            <div>
              <h1>天气真热啊</h1>
              <p>热的雪糕都化不了</p>
            </div>
          )
        }else{
          return (
            <div>
              <h1>天气真冷啊</h1>
              <p>冷死了</p>
            </div>
          )
        }
      }
      change = ()=>{
        const {isHot} = this.state
        this.setState({isHot: !isHot})
      }
    }
    ReactDOM.createRoot(document.getElementById('app')).render(<App/>)
    // class App extends React.Component{
    //   state = {
    //     isHot:true
    //   }

    //   render(){
    //     const {isHot} = this.state;
    //     if(isHot){
    //       return (
    //         <div>
    //           <h1>天气真热啊</h1>
    //           <p>热的雪糕都化不了</p>
    //         </div>
    //       )
    //     }else{
    //       return (
    //         <div>
    //           <h1>天气真冷啊</h1>
    //           <p>冷的牙疼</p>
    //         </div>
    //       )
    //     }
       
    //   }

    // }

    // const root = ReactDOM.createRoot(document.getElementById('app'));
    // root.render(<App/>)




  </script>
</body>

</html>